----- Original Message -----
From: "Rebecca Martin" <[email protected]>
Newsgroups: bit.listserv.ibm-main
Sent: Saturday, February 20, 2010 5:44 PM
Subject: Consolidate Storage Groups
We are a small shop with a big SMS mess as far as the ACS routines
and number of storage groups. We have over 80 storage groups for
about 10TBs of DASD and 3 LPARS (production, development,
systems). It evolved of a long time and without any rational reasons.
Right now there is some momentum for fixing these issues and
changing mind sets. The storage admin believes that he has to have
stand alone time to consolidate any of the storage groups because he
believes the datasets have to be moved.
I am not part of the small storage group, but I would really like to see
us clean up the SMS environment and get down to around 15 to 20
storage groups. I did a lot of searching, both the manuals and
archives, and didn't find anything that suggested moving the datasets
was a requirement. From one manual - I think it was the DFSMS
Storage Guide - it looked like you could just reassign all the volumes in
1 pool to another. There was a caution about getting all volumes that
contain multivolume datasets but other than that, what are the
gotchas? Is it that easy? Can I reassign all volumes in pool C, D, and
E to pool B and then just update the ACL routines to make sure
everything that was being assigned to C, D and E gets assigned storage
group B?
Since we have about 10 storage groups defined for volumes on our
sandbox, we do have groups to experiment with. But before suggesting
that we start this effort, instead of continuing to put it off due to
difficulty in getting large amounts of stand alone time, I'd know what is
really feasible and what pit falls we need avoid.
TIA
Rebecca
Rebecca,
If you find you want to move datasets, you can do largely non-disruptive
moves with FDRMOVE, from Innovation. It has advantages over DFDSS in that
you can "move" an in-use dataset and have it using the new volume, but you
will have to recycle the task holding the dataset in order to free the
space. Down and up and you're back in business. To use DFDSS, you have to
bring the task down first, wait for DFDSS to move the dataset, and then
bring the task up.
Regards,
Tom Conley
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